IETF #91 Hybrid Access Network (Bonding Two or More Accesses) draft-lhwxz-hybrid-access-network-architecture N. Leymann, C. Heidemann M. Wasserman Li Xue (Speaker), D. Zhang A. Petrescu S. Gundavelli IETF91, Honolulu 1 Typical Customer Edge (CE) Router • A typical CE router today has one DSL link in future a CE router will have a 3G/4G Link • A typical CE router today supports IPv4 in future a CE router will support IPv6 Wi-Fi Client Phone PC NAS Fixed TV CE Router Internet xDSL 2 BBF Activity Hybrid Access for Broadband Networks Work project was approved in June 2014 BBF meeting – 2014.546.03 3GPP RG Internet Fixed Hybrid Access = Gateway Function Bonding Gateway 3 Hybrid Access with Bonding Gateway Wi-Fi Client 3G/4G Phone 3G/4G Internet PC NAS Fixed TV xDSL CE Router Bonding Gateway Bonding Multiple Interfaces (Physical or Logical) on the CE Router 4 Hybrid Access without Bonding Gateway Wi-Fi Client 3G/4G Phone 3G/4G Internet/ Bonding Provider PC NAS Fixed TV xDSL CE Router Bonding Multiple Interfaces (Physical or Logical) on the CE Router The 3G/4G and fixed networks may belong to the same operator or to different operators 5 Hybrid Access Requirements (1) • Cost effective way to provide higher bandwidth – • Leverages existing network deployments Bandwidth on demand – If the fixed access network is fully utilized or reaches a certain congestion threshold, some bandwidth of the wireless access network can be added on demand • Improved service reliability – If one access network fails or is degraded, the service can still be provided without interruption through the other access network 6 Hybrid Access Requirements (2) • Decouples the life cycle for fixed and mobile access networks – Supplements the DSL network that may be difficult to upgrade, especially in certain areas • Faster provisioning – A customer can receive early service through the mobile access network while the fixed access network is being provisioned • Application based Path Selection – Traffic of specific applications may be statically associated with a specific access network • No software updates required on host 7 Traffic Distribution Schemes Flow A 3G/4G Host Bonding Gateway CE Router Flow B Internet Fixed Flow-Based Distribution Flow A Host 3G/4G Bonding Gateway CE Router Internet Fixed Packet-Based Distribution • Packet-based and flow-based distributions can be applied together • Flow-based: jitter sensitive flows (e.g., real-time VoIP) • Packet-based: higher bandwidth and jitter insensitive flows (e.g., data download) • Certain traffic types may be routed directly over a specific network, rather than through the bonded network 8 Flow-Based Distribution Per-flow 3G/4G Phone PC TV 3G/4G LTE LTE DSL DSL CE Router Fixed xDSL Bonding Gateway • Each traffic flow is carried over the 3G/4G network or over the fixed network • Not over both networks 9 Packet-Based Distribution Per-Packet 3G/4G Phone PC TV DSL first 3G/4G LTE LTE DSL CE Router Fixed xDSL DSL Bonding Gateway DSL offload On 3G/4G • If the traffic volume is lower than the fixed network bandwidth, all the traffic is carried on the fixed access network • If the traffic volume is higher than the fixed network bandwidth, the overflow packets are carried on the 3G/4G network 10 Path Failure 3G/4G Phone PC 3G/4G LTE LTE DSL Fixed TV CE Router xDSL DSL Bonding Gateway • If the 3G/4G path is down, the traffic is carried on the fixed network • If the fixed path is down, the traffic is carried on the 3G/4G network 11 Possible IETF Work • A mechanism to setup and bond multiple paths together • A mechanism to negotiate a traffic distribution for specific types of traffic (per-packet and/or per-flow) – Distributed solution: control plane – Centralized solution: centralized control entity • A mechanism to describe the traffic distribution policy – E.g., for flow-based distribution, flow A goes to 3G/4G, flow B goes to DSL, etc. • A mechanism to enable dynamic traffic distribution adjustments – To account for latency, bandwidth, MTU, etc. • A mechanism to monitor the state of each of the multiple paths • Support for both IPv4 and IPv6 • An example of an address assignment for bonding 12 Discussion • Any clarification question? 13 Thank You 14
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